Steel Weight Calculator
Calculate the weight of steel plates, round bars, square bars, pipes, and angles in pounds and kilograms. Supports carbon steel, stainless, aluminum, and copper.
in
in
ft
Weight (lbs)
—
Weight (kg) —
Extended More scenarios, charts & detailed breakdown ▾
in
in
ft
Weight (lbs)
—
Weight (kg) —
Professional Full parameters & maximum detail ▾
in
in
ft
Weight
Weight per Piece (lbs) —
Total Weight (lbs) —
Total Weight (kg) —
Cost Estimate
Estimated Cost —
How to Use This Calculator
- Select the steel shape (plate, round bar, square bar, pipe, or angle).
- Enter the dimensions in inches and length in feet.
- Results show weight in lbs and kg instantly.
Formula
Plate: Weight = T(in)/12 × W(in)/12 × L(ft) × density
Round bar: Weight = π × (D/24)² × L × density
Pipe: Weight = π × [(OD/24)² - (ID/24)²] × L × density
Example
Example: Carbon steel plate, 0.5-in thick, 12-in wide, 10-ft long → 204 lbs (92.5 kg).
Frequently Asked Questions
- Carbon steel has a density of approximately 490 lbs/ft³ (7,850 kg/m³), which is the standard value used for structural steel, mild steel, and most tool steels. Stainless steel is slightly denser at about 500 lbs/ft³ (8,000 kg/m³) depending on alloy. Aluminum is much lighter at 169 lbs/ft³ (2,710 kg/m³), making it about 3× lighter than steel by volume. Copper is denser than steel at 559 lbs/ft³ (8,960 kg/m³). Cast iron is about 450 lbs/ft³. This calculator supports carbon steel, stainless steel, aluminum, and copper for accurate weight estimates across materials.
- Steel plate weight = Thickness (ft) × Width (ft) × Length (ft) × Density (lbs/ft³). Convert inches to feet by dividing by 12. For a 0.5-inch thick × 12-inch wide × 10-foot long carbon steel plate: (0.5÷12) × (12÷12) × 10 × 490 = 0.0417 × 1 × 10 × 490 = 204 lbs. The rule of thumb for carbon steel plate is approximately 40.8 lbs per square foot per inch of thickness — so a 1-inch thick plate weighs about 40.8 lbs per square foot. This calculator accepts dimensions in inches and feet and converts automatically.
- Steel pipe weight = π × [(OD÷24)² − (ID÷24)²] × Length (ft) × Density (lbs/ft³), where OD is outer diameter and ID is inner diameter, both in inches, and dividing by 24 converts inches to feet with the radius formula. ID = OD − 2 × Wall Thickness. For example, a 4-inch OD pipe with 0.25-inch wall, 10 ft long: ID = 4 − 0.5 = 3.5 in. Weight = π × [(4÷24)² − (3.5÷24)²] × 10 × 490 = 3.14 × [0.0278 − 0.0213] × 10 × 490 = 100 lbs approximately. The calculator handles this formula in the Pipe tab.
- A 1-inch diameter carbon steel round bar weighs approximately 2.67 lbs per foot. The formula for round bar weight per foot is: Weight (lbs/ft) = (D²÷ 4) × π × (Density ÷ 144), where D is diameter in inches and density is in lbs/ft³. For a 1-inch diameter: (1² ÷ 4) × 3.14159 × (490 ÷ 144) = 0.7854 × 3.403 = 2.67 lbs/ft. Common reference weights: 0.5-in bar = 0.668 lbs/ft, 1-in = 2.67 lbs/ft, 2-in = 10.68 lbs/ft, 3-in = 24.03 lbs/ft.
- Divide pounds by 2.20462 to get kilograms. For example, 100 lbs ÷ 2.20462 = 45.36 kg. To go from kg to lbs, multiply by 2.20462: 100 kg × 2.20462 = 220.46 lbs. In industrial contexts, steel weight is often quoted in metric tons (tonnes): 1 tonne = 1,000 kg = 2,204.6 lbs. For shipping and procurement, knowing the weight in both lbs and kg is essential for international orders and freight calculations. This calculator always displays results in both pounds and kilograms.